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Elasmobranchii: Quiz

  

Question 1: The inner margin of each pelvic fin in the male fish is grooved to constitute a clasper for the transmission of ________.
Sexual reproductionSpermFertilisationSpermatozoon

Question 2: Many surviving orders of elasmobranch date back to the ________, or earlier.
Cretaceous–Tertiary extinction eventGeologic time scaleCretaceousDinosaur

Question 3: Many of these became extinct during the Permian, but the remaining sharks underwent a second burst of adaptive radiation during the ________, around which time the skates and rays first appeared.
JurassicDinosaurCretaceousGeologic time scale

Question 4: Fossilised shark teeth are known from the early ________, around 400 million years ago.
Geologic time scaleDevonianCarboniferousLate Devonian extinction

Question 5: This classification includes ________ and the extinct megalodon.
Great white sharkSmalltooth sand tigerAngel sharkSawshark

Question 6: Elasmobranchii is one of the two subclasses of cartilaginous fish in the class Chondrichthyes, the other being Holocephali (________).
ChimaeraBullhead sharkAngel sharkShark

Question 7: Members of the elasmobranchii subclass have no swim bladders, five to seven pairs of ________ clefts opening individually to the exterior, rigid dorsal fins, and small placoid scales.
Fish anatomyFishGillDemersal fish

Question 8: Batoidea (rays and skates)
________ (sharks)
Angel sharkBullhead sharkSharkGreat white shark

Question 9: During the following ________ period, the sharks underwent a period of diversification, with many new forms evolving.
CarboniferousDevonianOrdovicianGeologic time scale
















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